syntax fix - typeof is not a function, it's  an operator
syntax fix - typeof is not a function, it's  an operator

following the comment of @shesek here: https://github.com/bitpay/bitcore/pull/500/files#r16642032
`typeof(foo)` should be `typeof foo`
pnagurny/bitcore,bilthon/bitcore,phplaboratory/bitcore,KainiIndustries/hullcore,TOMOAKI12345/bitcore,UdjinM6/darkcore,GroestlCoin/groestlcore,williamcotton/bitcore,Kefkius/clamcore,janko33bd/bitcore,casinocoin/csc-bitcore-v0.1,bitpay/bitcore,daxxog/clamcore,initaldk/bitcore,MulticoinExplorer/bitcore,martindale/bitcore,bitpay/bitcore,martindale/bitcore,TeamPiggyCoin/PiggyCore,UdjinM6/bitcore-dash,pembo210/Litecore,williamcotton/bitcore,KainiIndustries/hullcore,olalonde/bitcore,braydonf/bitcore,casinocoin/csc-bitcore-v0.1,adjoinant/bitcore,bitjson/bitcore,genecyber/bitcore,Kefkius/clamcore,martindale/bitcore,jcvernaleo/bitcore,genecyber/bitcore,jcvernaleo/bitcore,eordano/bitcore,UdjinM6/darkcore,olalonde/bitcore,MulticoinExplorer/bitcore,TOMOAKI12345/bitcore,Kefkius/clamcore,iobond/bitcore,bitjson/bitcore,adjoinant/bitcore,habibmasuro/reddcore,eordano/bitcore,lekkas/bitcore,pembo210/Litecore,iobond/bitcore,MonetaryUnit/bitcore,litecoin-project/litecore,bankonme/bitcore,UdjinM6/darkcore,initaldk/bitcore,pembo210/Litecore,pnagurny/bitcore,iobond/bitcore,litecoin-project/litecore,daxxog/clamcore,KainiIndustries/hullcore,janko33bd/bitcore,UdjinM6/darkcore,eXcomm/bitcore,TeamPiggyCoin/PiggyCore,habibmasuro/reddcore,bitjson/bitcore,maraoz/coinforge,Kefkius/clamcore,bankonme/bitcore,MulticoinExplorer/bitcore,bitjson/bitcore,habibmasuro/reddcore,KainiIndustries/hullcore,casinocoin/csc-bitcore-v0.1,habibmasuro/reddcore,bitpay/bitcore,KainiIndustries/hullcore,KainiIndustries/hullcore,MulticoinExplorer/bitcore,casinocoin/csc-bitcore-v0.1,UdjinM6/darkcore,bilthon/bitcore,phplaboratory/bitcore,MulticoinExplorer/bitcore,bitpay/bitcore,lekkas/bitcore,Kefkius/clamcore,pembo210/Litecore,martindale/bitcore,maraoz/coinforge,casinocoin/csc-bitcore-v0.1,UdjinM6/darkcore,iobond/bitcore,habibmasuro/reddcore,casinocoin/csc-bitcore-v0.1,MonetaryUnit/bitcore,eXcomm/bitcore,iobond/bitcore,braydonf/bitcore